<!DOCTYPE html>
<html>
  <head>
    <link rel="stylesheet" href="styles/styles.css" />
    <style>
      body {
        background: #f60;
        padding: 10px;
      }
    </style>
  </head>
  <body >
    <h2>Hello!</h2>
    <script>
      window.setInterval(function() {
        document.querySelector('h2').style.color = '#' + 
          Math.floor(Math.random() * 256 * 256 * 256).toString(16);
      }, 100);
    </script>
  </body>
</html>